The giant wood moth’s large thorax — about the width of a finger — is what helps make it the heaviest moth, Dr. Shockley said. A female can carry up to 20,000 eggs in her abdomen.

The giant wood moth is so hefty, it can hardly fly. (Image credit: Mount Cotton State School) This giant wood moth was found at a construction site of a school building in Australia.

Female Giant Wood Moths have a wingspan of about 25 centimetres (9.8 inches) and can weigh up to 30g (just over an ounce), making them the heaviest moth in the world as well as one of the biggest ...